<template>
    <div class="login_container">
       <div class="login_box">
           <!--头像区域-->
           <div class="avatar_box">
            <img src="@/assets/logo.png">
           </div>
            <!--登录表单区域-->
        <el-form label-width="0px" ref="loginFormRef" class="login_form" :model="loginForm" :rules="loginFormRules">
            <!--用户名-->
            <el-form-item prop="username">
                <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
            </el-form-item>
            <!--密码-->
            <el-form-item prop="password">
                <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
            </el-form-item>
            <!--按钮区域-->
            <el-form-item class="btns"> 
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
        </el-form>
       </div>
    </div>
</template>

<script>
export default {
      data() {
          return {
              //这是登录表单的数据绑定对象
              loginForm: {
                  username: 'admin',
                  password: '123456'
              },
              //这是表单的验证规则对象
             loginFormRules: {
                 //验证用户名是否合法
                 username: [
                      { required: true, message: '请输入登录名称', trigger: 'blur' },
                      { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                 ],
                 //验证密码是否合法
                 password: [
                      { required: true, message: '请输入登录密码', trigger: 'blur' },
                      { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                 ]
             }
          }
      },
      methods: {
          //点击重置按钮，重置登录表单
          resetLoginForm() {
            //   console.log(this)
            this.$refs.loginFormRef.resetFields();
          },
          login() {
              this.$refs.loginFormRef.validate(async (valid) => {
                  //这是打印在控制台的，用户体验很差
            //     if(!valid) return;
            //     const {data : res} = await this.$axios.post("login", this.loginForm)
            //    if (res.meta.status !== 200) return console.log('登录失败')
            //    else  console.log('登录成功')
                //弹窗提示，良好的用户体验
                if(!valid) reutrn;
                const {data : res} = await this.$axios.post('login', this.loginForm)
                if(res.meta.status !== 200) return this.$message.error('登陆失败：用户名或密码错误');
                this.$message.success('登录成功');
                // 1.将登录成功之后的token保存到客户端的sessionStorage中
                // 1.1项目中除了登录之外的其他API接口，必须在登录后才可访问
                // 1.2 token只能在网站打开的时候有效，所以token存储在sessionStorage
                // 2. 通过编程式导航跳转到后台主页，路由地址的 /home
                console.log(res)
                window.sessionStorage.setItem('token', res.data.token);
                this.$router.push('/home')
              });
          }
      }
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}


    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50% );
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }

.btns{
    display: flex;
    justify-content: flex-end;
}

.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>